<template>
    <div>
      <!--      面包屑导航-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!--      卡片式图-->
      <el-card>
        <!--        提示区域-->
        <el-alert
          title="警告请选择三级菜单"
          type="warning"
          :closable="false"
          show-icon>
        </el-alert>
<!--        选择商品分类区-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
<!--            选择商品分类的级联选择框-->
            <el-cascader
              v-model="selectedCateKeys"
              :options="catelist"
              :props="cateProps"
              @change="handleChange"
              change-on-select></el-cascader>
          </el-col>
        </el-row>
<!--        tab标签区域-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--          添加动态参数面板-->
          <el-tab-pane label="动态参数" name="many">
<!--            添加参数按钮-->
            <el-button class="add" type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
<!--           动态参数表格-->
            <el-table :data="manyTableData" stripe border>
<!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--                  tag标签-->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!--                  输入框与按钮切换-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
<!--              索引类-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作" >
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
<!--          添加静态属性面板-->
          <el-tab-pane label="静态属性" name="only" >
<!--            添加属性-->
            <el-button class="add" type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!--           静态参数表格-->
            <el-table :data="onlyTableData" stripe border>
              <!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
<!--                  tag标签-->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
<!--                  输入框与按钮切换-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--              索引类-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作" >
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
<!--      添加参数的对话框-->
      <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>
      <!--      修改参数的对话框-->
      <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>

export default {
  name: 'Params',
  data() {
    return {
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择器选中的数组
      selectedCateKeys: [],
      // 被激活的标签
      activeName: 'many',
      // 动态属性定义数组
      manyTableData: [],
      // 静态属性定义数组
      onlyTableData: [],
      // 添加对话框是否可见
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单规则的验证对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            trigger: 'blur',
            message: '请输入参数名称'
          }
        ]
      },
      // 编辑对话框是否可见
      editDialogVisible: false,
      // 编辑表单规则的验证对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            trigger: 'blur',
            message: '请输入参数名称'
          }
        ]
      },
      // 编辑参数的表单数据对象
      editForm: {}
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商平分类
    async getCateList() {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
    },
    // 级联选择框变化会触发
    handleChange() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.onlyTableData = []
        this.manyTableData = []
        return false
      }
      // 没return证明选中了三级分类
      // console.log(this.selectedCateKeys)
      // 根据分类与ID与面板获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框的内容
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab栏点击时触发
    handleTabClick() {
      this.getParamsData()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加属性失败！')
        }
        this.$message.success('添加属性成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮修改对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听编辑对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('编辑属性失败！')
        }
        this.$message.success('编辑属性成功！')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 删除属性
    async deleteParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      // 用户取消了删除操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点或按下回车键触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击按钮显示文本框
    showInput(row) {
      row.inputVisible = true
      // 自动获得焦点
      // $nextTick重新渲染元素时调用
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 删除对应的row和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // eslint-disable-next-line vue/return-in-computed-property
    // 添加按钮是否禁用
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 选中的三级分类ID
    // eslint-disable-next-line vue/return-in-computed-property
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    // eslint-disable-next-line vue/return-in-computed-property
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
  .add{
    float: left;
    margin-bottom: 10px;
  }
  .el-col{
    text-align: left;
  }
  .el-tag{
    margin:5px 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
